Particle Rendering problem (looks like a texture rather than particle)
The issue is that you have the particle size set way too small. I changed it to a size of 1.00:



And got a result like this:



At a size of 0.020 the particles are less than 1 pixel across, making some of them invisible to the camera, and blurring others. By changing the size for all of the particle systems, I got this result: